Composite oil seal having electric corrosion prevention function and method of manufacturing ground path thereof

Abstract

There is provided a composite oil seal having an electric corrosion prevention function. The composite oil seal includes: a seal main body configured to seal an interior of a motor housing in a state of being mounted to a shaft in the motor housing; and a ground path mounted to the seal main body. The ground path is configured to electrically connect the shaft to the motor housing to allow current induced in the shaft to flow to the motor housing. ( )

What is claimed is: 
     
       1. A composite oil seal having an electric corrosion prevention function, the composite oil seal comprising:
 a seal main body configured to seal an interior of a motor housing in a state of being mounted to a shaft in the motor housing; 
 a ground path mounted to the seal main body, the ground path being configured to electrically connect the shaft to the motor housing to allow current induced in the shaft to flow to the motor housing; and 
 a support member configured to detachably fix the ground path to the seal main body, 
 wherein the seal main body has a mounting groove formed therein, and 
 wherein the support member comprises: 
 a support detachably mounted in the mounting groove; 
 an arm fixed to the support; and 
 a support case located at an end of the arm to accommodate and support the ground path. 
 
     
     
       2. A composite oil seal having an electric corrosion prevention function, the composite oil seal comprising:
 a seal main body configured to seal an interior of a motor housing in a state of being mounted to a shaft in the motor housing; and 
 a ground path mounted to the seal main body, the ground path being configured to electrically connect the shaft to the motor housing to allow current induced in the shaft to flow to the motor housing, 
 wherein the ground path comprises a conductive layer in which a conductive thread having a yarn shape and made of a conductive material is patterned, 
 wherein the conductive layer comprises at least two conductive layers stacked one above another, and 
 wherein the at least two conductive layers comprise: 
 a first conductive layer formed in such a manner that a first conductive thread is wound in a circumferential direction about a center of the seal main body; and 
 a second conductive layer formed in such a manner that a second conductive thread extends in a radial direction about the center of the seal main body so as to intersect the first conductive thread, the second conductive layer being in contact with the first conductive layer. 
 
     
     
       3. The composite oil seal according to  claim 2 , wherein the ground path further comprises:
 a fixing sheet configured to be adhered to the seal main body; and 
 a fixing thread fixing the conductive layer to the fixing sheet. 
 
     
     
       4. The composite oil seal according to  claim 3 , wherein the conductive thread has a diameter of 0.1 to 2 mm, and is used as any one of an upper thread and a lower thread for use in a sewing machine, and
 wherein the fixing thread is formed in a same pattern as the conductive thread, is used as a remaining one of the upper thread and the lower thread for use in the sewing machine, and is sewn together with the conductive thread to fix the conductive thread to the fixing sheet. 
 
     
     
       5. The composite oil seal according to  claim 4 , wherein the fixing thread passes through both sides of the fixing sheet along the conductive thread so as to be alternately located on one side and another side of the fixing sheet, and a portion of the fixing thread that is located on the one side of the fixing sheet crosses and presses an upper surface of the conductive thread to fix the conductive thread. 
     
     
       6. The composite oil seal according to  claim 3 , wherein the fixing sheet is made of a fiber material, and is coated with a conductive spray. 
     
     
       7. The composite oil seal according to  claim 2 , wherein the first conductive layer is formed in such a manner that the first conductive thread is continuously wound in a spiral shape in the circumferential direction about the center of the seal main body, and
 wherein the second conductive layer is continuously formed in a wave shape such that two adjacent sections thereof cross the first conductive thread of the first conductive layer in parallel with each other. 
 
     
     
       8. The composite oil seal according to  claim 2 , wherein the conductive thread is made of a carbon fiber material. 
     
     
       9. A method of manufacturing a ground path of the composite oil seal described in  claim 3 , the method comprising:
 loading each of a first fixing thread and a second fixing thread on a sewing machine as one of an upper thread and a lower thread; 
 sewing the first conductive thread and the first fixing thread to the fixing sheet using the sewing machine to form the first conductive layer and to fix the first conductive layer to the fixing sheet; and 
 sewing the second conductive thread and the second fixing thread to the fixing sheet using the sewing machine to form the second conductive layer and to fix the second conductive layer to the fixing sheet. 
 
     
     
       10. The method according to  claim 9 , wherein, in the sewing the first conductive thread and the first fixing thread and the sewing the second conductive thread and the second fixing thread, the first conductive thread and the second conductive thread are fixed to the fixing sheet by stitching the first fixing thread and the second fixing thread through the fixing sheet. 
     
     
       11. The method according to  claim 10 , wherein the sewing the first conductive thread and the first fixing thread comprises:
 stitching the first fixing thread through the fixing sheet to fix the first conductive layer to the fixing sheet while continuously winding the first conductive thread in a spiral shape in the circumferential direction about the center of the seal main body, and 
 wherein the sewing the second conductive thread and the second fixing thread comprises: 
 stitching the second fixing thread through the fixing sheet to fix the second conductive layer to the fixing sheet while continuously forming the second conductive thread on an upper surface of the first conductive layer in a wave shape in the radial direction about the center of the seal main body such that the second conductive thread crosses the first conductive thread.